-51.1% is the change from 636 to 311
Calculation steps:
[( 311 - 636 ) ÷ 636] x 100 = -51.1%
Formula
Percentage change = [(311 - 636) / 636] x 100
Subtract the new number by the original number
311 - 636 = -325
-325 ÷ 636 = -0.5110062893081762
-0.5110062893081762 x 100 = -51.1%